I seem to remember Tiger referring to him as Pops and The Golf Channel said tonight that he got emotional when they were walking down (up?) the 18th fairway and Steve Williams leaned over and said, "This one was for Pops."

http://www.nytimes.com/iht/2006/07/20/sports/IHT-20rtiger.html ("There were more questions Tuesday as Woods met the press in Hoylake. "I've come to terms with it, there's no doubt about that," he said of his father's death. "It's not like I can pick up the phone and call him and say, 'Pop, what do you think about my putting stroke?'")